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Rozycki" , linux-mips@linux-mips.org, Ralf Baechle , Sasha Levin Subject: [PATCH 4.4 083/114] MIPS: DEC: Fix an int-handler.S CPU_DADDI_WORKAROUNDS regression Date: Thu, 8 Nov 2018 13:51:38 -0800 Message-Id: <20181108215108.434680211@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181108215059.051093652@linuxfoundation.org> References: <20181108215059.051093652@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 68fe55680d0f3342969f49412fceabb90bdfadba ] Fix a commit 3021773c7c3e ("MIPS: DEC: Avoid la pseudo-instruction in delay slots") regression and remove assembly errors: arch/mips/dec/int-handler.S: Assembler messages: arch/mips/dec/int-handler.S:162: Error: Macro used $at after ".set noat" arch/mips/dec/int-handler.S:163: Error: Macro used $at after ".set noat" arch/mips/dec/int-handler.S:229: Error: Macro used $at after ".set noat" arch/mips/dec/int-handler.S:230: Error: Macro used $at after ".set noat" triggering with with the CPU_DADDI_WORKAROUNDS option set and the DADDIU instruction. This is because with that option in place the instruction becomes a macro, which expands to an LI/DADDU (or actually ADDIU/DADDU) sequence that uses $at as a temporary register. With CPU_DADDI_WORKAROUNDS we only support `-msym32' compilation though, and this is already enforced in arch/mips/Makefile, so choose the 32-bit expansion variant for the supported configurations and then replace the 64-bit variant with #error just in case. Fixes: 3021773c7c3e ("MIPS: DEC: Avoid la pseudo-instruction in delay slots") Signed-off-by: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Cc: stable@vger.kernel.org # 4.8+ Patchwork: https://patchwork.linux-mips.org/patch/16893/ Signed-off-by: Ralf Baechle Signed-off-by: Sasha Levin --- arch/mips/dec/int-handler.S | 34 ++++++---------------------------- 1 file changed, 6 insertions(+), 28 deletions(-) diff --git a/arch/mips/dec/int-handler.S b/arch/mips/dec/int-handler.S index 554d1da97743..21f4a9fe82fa 100644 --- a/arch/mips/dec/int-handler.S +++ b/arch/mips/dec/int-handler.S @@ -147,23 +147,12 @@ * Find irq with highest priority */ # open coded PTR_LA t1, cpu_mask_nr_tbl -#if (_MIPS_SZPTR == 32) +#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) # open coded la t1, cpu_mask_nr_tbl lui t1, %hi(cpu_mask_nr_tbl) addiu t1, %lo(cpu_mask_nr_tbl) - -#endif -#if (_MIPS_SZPTR == 64) - # open coded dla t1, cpu_mask_nr_tbl - .set push - .set noat - lui t1, %highest(cpu_mask_nr_tbl) - lui AT, %hi(cpu_mask_nr_tbl) - daddiu t1, t1, %higher(cpu_mask_nr_tbl) - daddiu AT, AT, %lo(cpu_mask_nr_tbl) - dsll t1, 32 - daddu t1, t1, AT - .set pop +#else +#error GCC `-msym32' option required for 64-bit DECstation builds #endif 1: lw t2,(t1) nop @@ -214,23 +203,12 @@ * Find irq with highest priority */ # open coded PTR_LA t1,asic_mask_nr_tbl -#if (_MIPS_SZPTR == 32) +#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) # open coded la t1, asic_mask_nr_tbl lui t1, %hi(asic_mask_nr_tbl) addiu t1, %lo(asic_mask_nr_tbl) - -#endif -#if (_MIPS_SZPTR == 64) - # open coded dla t1, asic_mask_nr_tbl - .set push - .set noat - lui t1, %highest(asic_mask_nr_tbl) - lui AT, %hi(asic_mask_nr_tbl) - daddiu t1, t1, %higher(asic_mask_nr_tbl) - daddiu AT, AT, %lo(asic_mask_nr_tbl) - dsll t1, 32 - daddu t1, t1, AT - .set pop +#else +#error GCC `-msym32' option required for 64-bit DECstation builds #endif 2: lw t2,(t1) nop -- 2.17.1